Construction of parts providing fits

Abstract

An assembly includes a male member fitted in the bore of a female member in a rigid or slidable manner, with at least one of the confronting peripheral surfaces of both members being formed with a plurality of equally spaced projections which are positioned between the two members. These projections are of such a shape as to afford a low mechanical strength, such as for instance, triangular or trapezoidal in cross section, and contribute to eliminating any looseness in the fit between the assembled members. The projections may be cut or collapsed or otherwise altered under pressure by a face of the opposite member in which the projection carrying member is fitted during assembly thereby eliminating any clearance between the members with the resulting obviation of looseness.

I claim: 
     
       1. An interfitting parts assembly comprising: a female member having a bore with a first continuous peripheral face;   a male member fitted in said bore with a clearance fit and having a second continuous peripheral face confronting and spaced from said first continuous peripheral face to delineate a clearance equally around the face of the male member;   a plurality of equally circumferentially spaced projecting portions, the heights of which do not exceed one and one half the maximum of said clearance between said first and second faces formed on one of said faces and having a mechanical strength lower than that of said members, whereby said clearance is at least reduced with the interfitting of said members;   the height of said projecting portions being greater in dimension than the minimum clearance between said first and second faces;   a portion of one of said members at an initial engaging end being formed with a tapered portion for facilitating the assembly of said members whereby there is provided a cavity delineated by said tapered portion for trapping cutting-chips of said projecting portions therein attendant to the assembly of said members;   said projecting portions being in the form of linear ridges parallel with the longitudinal direction of said male member.   
     
     
       2. An interfitting parts assembly comprising: a female member having a bore with a first continuous peripheral face;   a male member fitted in said bore with a clearance fit and having a second continuous peripheral face confronting and spaced from said first continuous peripheral face to delineate a clearance equally around the face of the male member;   a plurality of equally circumferentially spaced projecting portions, the heights of which do not exceed one and one half the maximum of said clearance between said first and second faces formed on one of said faces and having a mechanical strength lower than that of said members, whereby said clearance is at least reduced with the interfitting of said members;   the height of said projecting portions being greater in dimension than the minimum clearance between said first and second faces;   a portion of one of said members at an initial engaging end being formed with a tapered portion for facilitating the assembly of said members whereby there is provided a cavity delineated by said tapered portion for trapping cutting-chips of said projecting portions therein attendant to the assembly of said members;   said projecting portions being in the form of annular ridges coaxial with the longitudinal axis of said male member.   
     
     
       3. An interfitting parts assembly comprising: a female member having a bore with a first continuous peripheral face;   a male member fitted in said bore with a clearance fit and having a second continuous peripheral face confronting and spaced from said first continuous peripheral face to delineate a clearance equally around the face of the male member;   a plurality of equally circumferentially spaced projecting portions, the heights of which do not exceed one and one half the maximum of said clearance between said first and second faces formed on one of said faces and having a mechanical strength lower than that of said members, whereby said clearance is at least reduced with the interfitting of said members;   the height of said projecting portions being greater in dimension than the minimum clearance between said first and second faces;   a portion of one of said members at an initial engaging end being formed with a tapered portion for facilitating the assembly of said members whereby there is provided a cavity delineated by said tapered portion for trapping cutting-chips of said projecting portions therein attendant to the assembly of said members;   said projecting portions comprising a helical ridge coaxial with the longitudinal axis of said male member.   
     
     
       4. An interfitting parts assembly comprising: a female member having a bore with a first continuous peripheral face;   a male member fitted in said bore with a clearance fit and having a second continuous peripheral face confronting and spaced from said first continuous peripheral face to delineate a clearance equally around the face of the male member;   a plurality of equally circumferentially spaced projecting portions, the heights of which do not exceed one and one half the maximum of said clearance between said first and second faces formed on one of said faces and having a mechanical strength lower than that of said members, whereby said clearance is at least reduced with the interfitting of said members;   the height of said projecting portions being greater in dimension than the minimum clearance between said first and second faces;   a portion of one of said members at an initial engaging end being formed with a tapered portion for facilitating the assembly of said members whereby there is provided a cavity delineated by said tapered portion for trapping cutting-chips of said projecting portions therein attendant to the assembly of said members;   said projecting portions being initially in the form of a plurality of projections of conical shape.   
     
     
       5. An interfitting parts preassembly for a camera comprising: a female member having a bore therein with a first continuous peripheral face;   a male member having a section thereof at least partially insertable in said bore and having an outer second continuous peripheral face confronting and spaced from said first peripheral face when said male member section registers with said bore to delineate a clearance space; and   circumferentially spaced projections disposed on one of said peripheral faces and extending toward the other of said peripheral faces and having a mechanical strength lower than that of said member having said other peripheral face so as to be permanently deformed as said projections engage said member having said other peripheral face upon insertion of said male member section into said bore and said projections having the same height which is greater than 0.5 times and not exceeding 1.5 times the maximum width of said clearance space.   
     
     
       6. The preassembly of claim 5 wherein the height of said projections is greater than the width of said clearance space. 
     
     
       7. The preassembly of claim 5 wherein said bore is inwardly tapered at an end thereof. 
     
     
       8. The preassembly of claim 5 wherein said bore and said male member insertable sections are of substantially circular transverse cross-section. 
     
     
       9. The preassembly of claim 8 wherein said projections comprise equally circumferentially spaced longitudinally extending ridges. 
     
     
       10. The preassembly of claim 8 wherein said projections comprise longitudinally spaced circumferentially extending ridges. 
     
     
       11. The preassembly of claim 8 wherein said projections comprise a longitudinally helically extending ridge. 
     
     
       12. The preassembly of claim 8 wherein said projections comprise regularly spaced conical protuberances. 
     
     
       13. An interfitting parts assembly for a camera comprising: a female member having a bore therein with a first continuous peripheral face;   a male member having a section thereof at least partially insertable in said bore and having an outer second continuous peripheral face confronting and spaced from said first continuous peripheral face when said male member section registers with said bore to delineate a clearance space equally around said second face;   circumferentially spaced projections, the heights of which do not exceed one and one half the maximum of said clearance between said first and second faces disposed on one of said faces of one of said members and having a mechanical strength lower than that of the other of said members, so as to be permanently deformed when said projections engage said other member upon insertion of said male member section into said bore, whereby said clearance is at least reduced with interfitting of said members; and   a tapered portion formed at an initial engaging end of said other member and being free of said, projections for facilitating the assembly of said members.   
     
     
       14. The assembly of claim 13 wherein the height of said projections is greater in dimension than the minimum clearance between said first and second faces. 
     
     
       15. The assembly of claim 14 further comprising a wall portion provided on one of said members which has said projections, said wall portion engageable with the initial engaging end of another one of said members and cooperative with said tapered portion to delineate a cavity for trapping debris from the projections therein, upon the male member being assembled with the female member. 
     
     
       16. The assembly of claim 15 wherein said projections are in the form of linear parallel ridges parallel with the longitudinal direction of said male member. 
     
     
       17. The assembly of claim 15 wherein said projections are in the form of annular ridges coaxial with the longitudinal axis of said male member. 
     
     
       18. The assembly of claim 15 wherein said projecting portions comprise a helical ridge coaxial with the longitudinal axis of said male member. 
     
     
       19. The assembly of claim 15 wherein said projections are initially in the form of a plurality of projections of conical shape.